1. Department of Surgery and Cancer, Imperial College London, London, UK
2. Oxford Oesophago Gastric Centre, Oxford University Hospitals NHS Trust, Oxford, UK
3. Department of Surgery, James Cook University Hospital, Middlesborough, UK
4. Academic Department of Surgery, University of Birmingham, Birmingham, UK
5. Upper GI Surgery Unit, The Royal London Hospital, London, UK
6. Department of Upper GI Surgery, Luton and Dunstable Hospital, Luton, UK
7. Upper Gastrointestinal Surgery, University College London, London, UK
8. Department of Upper GI Surgery, Queen Alexandra Hospital, Portsmouth, UK
9. Upper GI Surgery, Guy’s and St Thomas’ NHS Foundation Trust, London, UK